LG 26LH2000 Service Manual
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Check location of noise Identify nose type Circuit noise Replace inverterReplace LIPS B/D Mechanical noise Check location of noise OR When the nose is severe, replace the module (For models with fix information, upgrade the S/W or provide the description) OR If there is a “Tak Tak” noise from the cabinet, refer to the KMS fix information and then proceed as shown in the solution manual (For models without any fix information, provide the description) OR Mechanical noise is a natural phenomenon, and apply the 1st level description. When the customer does not agree, apply the process by stage. Describe the basis of the description in “Part related to nose” in the Owner’s Manual. E. Noise Circuit noise, mechanical noise Established date Revised date 2008. 3 .05 12/13 LCD TV Error symptom Standard Repair Process 12
Replace module Zoom part with exterior damage Module damageCabinet damage Replace cabinetReplace remote controller Remote controller damageStand dent Replace stand F. Exterior defect Exterior defect Adjust VCOMEstablished date Revised date 2008. 3 .05 13/13 LCD TV Error symptom Standard Repair Process 13
LCD TV Repair Process Index - Trouble shooting by input block (Component level check) No. Symptom (L) Input Block Page Remark 1 Power Problem Power-up Boot fail 1~2 2 Video ProblemNo OSD 3~4 3 Digital TV 5 4 Analog TV 6 5 AV (Scart / CVBS/ S-Video)7~12 6 Component 13 7 RGB(D-SUB) 14~15 8 HDMI 16~17 9 Audio ProblemAll Input 18 10 Digital TV 19 11 Analog TV 20 12 AV / Component / RGB, HDMI-PC/ HDMI-DTV21~26 13AV Audio out / No Audio (Headphone & SPDIF)27~30 14 USB / Remocon Problem USB no connect / Remocon 31~33 15 Intelligent Sensor Intelligent Sensor 34
P800 Pin #7~#10 Voltage Level = 5V ? P800 Pin #2 Voltage level = 5V ? Check Power connector OK ? Replace Power Board YESNO YES P800 Pin #13, 14 = 12V P800 Pin #17, 18 = 24V ? NO Replace Power Board YES NO Replace MAIN B’D Q801 MAIN B’D L803 = 3.3V ? Replace MAIN B’D IC801 YES NO MAIN B’D L813 = 1.26V ? Replace MAIN B’D IC805 YES NO MAIN B’D L805 = 3.3V ? Replace MAIN B’D IC806 YES NO Check MAIN B’D X100 Clock 12MHz Replace MAIN B’D IC100 YES NO Replace MAIN B’D IC102 NAND FLASH YES Replace MAIN B’D IC103 Serial Flash NO Replace MAIN B’D IC300, IC301 DDR2 Memory NO Replace MAIN B’D IC100 NO Making Revision 2009. 2 . 1 1/34 LCD TV Symptom Power-Up Boot Fail 26~42LH2000 32~47LH3000/LH4000
Check Power connector OK ? Replace Power Board NO YES Replace Power Board NO Replace MAIN B’D IC801 NO Replace MAIN B’D IC805 NO Replace MAIN B’D IC806 NO Replace MAIN B’D IC100 NO Replace MAIN B’D IC103 Serial Flash NO Replace MAIN B’D IC300, IC301 DDR2 Memory NO Replace MAIN B’D IC100 NO Making Revision 2009. 2 . 1 LCD TV Symptom Power-Up Boot Fail 19~22LH20002/34 P801 Pin #5~#6 Voltage Level = 5V ? YES P801 Pin #1, 2 = 15V?MAIN B’D L803 = 3.3V ? YES MAIN B’D L813 = 1.26V ? YES MAIN B’D L805 = 3.3V ? YES Check MAIN B’D X100 Clock 12MHz YES Replace MAIN B’D IC102 NAND FLASH YES
P800 Pin #20 Voltage level = 2V Check Power connector OK ? Replace Power Board YESNO YES NO YES Replace MAIN B’D Q802 MAIN B’D L1300 = 12V ? Replace MAIN B’D Q806 NO Replace Main Board YES P800 Pin #13, 14 = 12V P800 Pin #17, 18 = 24V ? Check LVDS Cable OK ? YES Replace LVDS Cable NO Making Revision 2009. 2 . 1 LCD TV Symptom No OSD 26~42LH2000 32~47LH3000/LH40003/34
P801 Pin #9 Voltage level = 2V Check Power connector OK ? Replace Power Board YESNOYES NO YES Replace MAIN B’D Q802 MAIN B’D L1300 = 12V ? Replace MAIN B’D Q806 NO Replace Main Board YES P801 Pin #1, 2 = 15V?Check LVDS Cable OK ? YES Replace LVDS Cable NO Making Revision 2009. 2 . 1 LCD TV Symptom No OSD 19~22LH20004/34
Check RF Cable MAIN B’D L1201 = 5V ? YES MAIN B’D L1202 = 3.3V ? NO Replace MAIN B’D IC809 YES NO Replace MAIN B’D IC808 MAIN B’D IC804 Pin #2 = 1.2V ? Replace MAIN B’D IC804 YES NO YES MAIN B’D R1210 Clock ? NO Replace MAIN B’D TU1200 Making Revision 2009. 2 . 1 LCD TV Symptom Digital TV Video Problem 26~42LH2000 32~47LH3000/LH40005/34
Making Revision 2009. 2 . 1 LCD TV Symptom Analog TV Video Problem Check RF Cable MAIN B’D L1201 = 5V ? YES MAIN B’D L1202 = 3.3V ? NO Replace MAIN B’D IC809 YES NO Replace MAIN B’D IC808 MAIN B’D IC804 Pin #2 = 1.2V ? Replace MAIN B’D IC804 YES NO YES MAIN B’D R1210 Clock ? NO Replace MAIN B’D TU1200 26~42LH2000 32~47LH3000/LH40006/34
Check Signal format Is it supported?Check the SCART Cable YES MAIN B’D JK1100 Check Replace MAIN B’D JK1100 YES NO Check MAIN B’D R1117 Video Signal ? NO YES Check MAIN B’D C210 Video Signal ? Replace MAIN B’D C210 NO Replace MAIN B’D IC 100 YES Making Revision 2009. 2 . 1 LCD TV Symptom AV1(Scart CVBS) No Video Problem 26~42LH2000 32~47LH3000/LH40007/34